Polycarbonate resin composition and molded product comprising same

Abstract

Disclosed herein is a polycarbonate resin composition. The polycarbonate resin composition includes a polycarbonate resin, inorganic fillers, an impact modifier comprising a modified olefin-based copolymer, and olefin wax containing a reactive group comprising at least one of a carboxylic acid group, a carboxylic acid anhydride group, an epoxy group, and a glycidyl group, wherein the inorganic fillers comprise flake-type fillers and needle-like fillers. The polycarbonate resin composition has excellent properties in terms of appearance, mechanical properties, and dimensional stability.

The invention claimed is: 
     
       1. A polycarbonate resin composition, comprising:
 about 100 parts by weight of a polycarbonate resin; 
 about 5 parts by weight to about 30 parts by weight of inorganic fillers; 
 about 1 part by weight to about 10 parts by weight of an impact modifier comprising a modified olefin-based copolymer and a core-shell graft impact modifier, wherein the modified olefin-based copolymer comprises an ethylene-methyl acrylate copolymer (EMA) and/or an ethylene-ethyl acrylate copolymer (EEA); and 
 about 0.1 parts by weight to about 1.0 part by weight of an olefin wax containing a reactive group comprising at least one of a carboxylic acid group, a carboxylic acid anhydride group, an epoxy group, and a glycidyl group, 
 wherein the inorganic fillers comprise flake-type fillers and needle-like fillers. 
 
     
     
       2. The polycarbonate resin composition according to  claim 1 , wherein the flake-type fillers comprise talc, mica, or a mixture thereof, and the needle-like fillers comprise wollastonite, whiskers, glass fibers, basalt fibers, or a mixture thereof. 
     
     
       3. The polycarbonate resin composition according to  claim 1 , wherein the flake-type fillers are present in an amount of about 1 wt % to about 99 wt % based on the total weight of the inorganic fillers and the needle-like fillers are present in an amount of about 1 wt % to about 99 wt % based on the total weight of the inorganic fillers. 
     
     
       4. The polycarbonate resin composition according to  claim 1 , wherein a weight ratio of the flake-type fillers to the needle-like fillers ranges from about 1:0.5 to about 1:2. 
     
     
       5. The polycarbonate resin composition according to  claim 1 , wherein the flake-type fillers have an average thickness of about 30 nm to about 700 nm, an average particle size of about 0.65 μm to about 5.0 μm, and a ratio of average diameter to average thickness (diameter/thickness) of about 4 to about 30, and the needle-like fillers have an average diameter D of about 0.01 μm to about 15 μm, an average length L of about 3 μm to about 3,000 μm, and a ratio of average length to average diameter (L/D) of about 10 to about 200. 
     
     
       6. The polycarbonate resin composition according to  claim 1 , wherein a weight ratio of the modified olefin-based copolymer to the core-shell graft impact modifier ranges from about 1:0.1 to about 1:10. 
     
     
       7. The polycarbonate resin composition according to  claim 1 , wherein the reactive group-containing olefin wax has a weight average molecular weight of about 5,000 g/mol to about 50,000 g/mol. 
     
     
       8. The polycarbonate resin composition according to  claim 1 , further comprising:
 at least one additive selected from among release agents, flame retardants, flame retardant aids, lubricants, plasticizers, heat stabilizers, dripping inhibitors, antioxidants, light stabilizers, pigments, and dyes. 
 
     
     
       9. The polycarbonate resin composition according to  claim 1 , wherein the polycarbonate resin composition has an Izod impact strength of about 13.5 kgf·cm/cm to about 20 kgf·cm/cm, as measured on an about ⅛″ thick specimen in accordance with ASTM D256 and a coefficient of linear expansion of about 40×10 −6  cm/cm° C. to about 55×10 −6  cm/cm° C., as measured on an about 6.4 mm flexural specimen at a temperature of about 10° C. to about 90° C. in accordance with ASTM D696. 
     
     
       10. The polycarbonate resin composition according to  claim 1 , wherein the polycarbonate resin composition has a degree of warpage of about 13.5 mm or less, as measured through a procedure in which three corners of an injection-molded specimen having a size of about 15 cm×about 40 cm×about 15 mm (injection temperature: about 310° C., mold temperature: about 80° C.) are attached to the ground, followed by leaving the specimen at about 23° C. and about 50% RH, and the distance from the ground to the other corner of the specimen is measured. 
     
     
       11. A molded article formed of the polycarbonate resin composition according to  claim 1 .